15512020155 has 64 divisors (see below), whose sum is σ = 28288189440. Its totient is φ = 8060256000.

The previous prime is 15512020151. The next prime is 15512020159. The reversal of 15512020155 is 55102021551.

It is an interprime number because it is at equal distance from previous prime (15512020151) and next prime (15512020159).

It is not a de Polignac number, because 15512020155 - 2² = 15512020151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (15512020151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5439480 + ... + 5442330.

It is an arithmetic number, because the mean of its divisors is an integer number (442002960).

Almost surely, 2^15512020155 is an apocalyptic number.

15512020155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15512020155 is a deficient number, since it is larger than the sum of its proper divisors (12776169285).

15512020155 is a wasteful number, since it uses less digits than its factorization.

15512020155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3889 (or 3883 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The spelling of 15512020155 in words is "fifteen billion, five hundred twelve million, twenty thousand, one hundred fifty-five".